An unlit internet LED or WAN Port Unplugged message means the router is not detecting the expected link at its internet port.
What Internet light off means
An unlit internet LED or WAN Port Unplugged message means the router is not detecting the expected link at its internet port.
What you may notice
- Wi-Fi is visible but has no internet
- The WAN LED is off
- Setup reports an unplugged port
- A direct modem connection may work
Most likely causes
- 01The Ethernet cable is loose or faulty
- 02The modem is offline
- 03The cable is in a LAN port
- 04Link-speed negotiation failed
- 05The router WAN port is damaged
Safe checks, in order
Start with the simplest non-invasive check. Stop as soon as the error clears; repeated resets can hide a condition without correcting it.
Verify cable and port
Use an RJ45 Ethernet cable from the modem to the router's WAN or Internet port.
Test the modem
When your provider permits it, connect a computer directly. If that fails, troubleshoot the modem or ISP first.
Try another cable
A cable can look intact and still fail to establish a link.
Restart in order
Start the modem first and wait until it is online before powering the router.
Use model-specific settings
Change internet-port negotiation only as described for the exact router.
Know where to stop
Never connect a router to damaged power or network cabling. A factory reset removes configuration and is not the first diagnostic step.
When to call a technician or support
Contact the ISP if a direct modem test fails. Contact TP-Link if the modem and cable work but the WAN port never links.
When you call, have the exact product or vehicle model, model year where relevant, the complete code or symbol, and when it appeared.
Where this information came from
We use the manufacturer's current published guidance as the starting point, then organize it into a safer, beginner-friendly sequence.
TP-Link Support — Internet light off / WAN port unplugged Source last checked August 16, 2026. Manufacturer instructions and model manuals take priority over this independent summary.